.How many of the given plants have zygomorphic flowers? Mustard, Datura, Chilli, Gulmohur, Bean
(1) Four
(2) Three
(3) Two
(4) One
Answer ▽ ✅Verified
Answer (3) Gulmohar and Bean
THE FLOWER: A typical flower has four different kinds of whorls arranged successively on the swollen end of the stalk or pedicel, called thalamus or receptacle. These are calyx, corolla, androecium and gynoecium. Calyx and corolla are accessory organs, while androecium and gynoecium are reproductive organs. In some flowers like lily, the calyx and corolla are not distinct and are termed as perianth. When a flower has both androecium and gynoecium, it is bisexual. A flower having either only stamens or only carpels is unisexual. In symmetry, the flower may be actinomorphic (radial symmetry) or zygomorphic (bilateral symmetry). When a flower can be divided into two equal radial halves in any radial plane passing through the centre, it is said to be actinomorphic, e.g., mustard, datura, chilli. When it can be divided into two similar halves only in one particular vertical plane, it is zygomorphic, e.g., pea, gulmohur, bean, Cassia. A flower is asymmetric (irregular) if it cannot be divided into two similar halves by any vertical plane passing through the centre, as in canna.
The floral formula is represented by some symbols.÷for zygomorphic nature of flower.
Fabaceae Flower: bisexual, zygomorphic
Solanaceae Flower: bisexual, actinomorphic
Liliaceae Flower: bisexual; actinomorphic
Define the following terms: (a) aestivation (b) placentation (c) actinomorphic (d) zygomorphic (e) superior ovary (f) perigynous flower (g) epipetalous stamen
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